"From the Ted Talk by James Green: 3 moons and a planet that could have alien life"

Unscramble the Blue Letters

And so about 15 years ago, we started a seiers of missions to go to Mars and see if water existed on Mars in its past that changed its geology. We ought to be able to notice that. And indeed we started to be sieursrpd right away. Our higher resolution images show deltas and river valleys and gulleys that were there in the past. And in fact, cuitroisy — which has been rvoing on the surface now for about three years — has really shown us that it's sitting in an ancient river bed, where water foelwdralipdy. And not for a little while, perhaps hundreds of millions of years. And if everything was there, including organics, perhaps life had started.

Open Cloze

And so about 15 years ago, we started a ______ of missions to go to Mars and see if water existed on Mars in its past that changed its geology. We ought to be able to notice that. And indeed we started to be _________ right away. Our higher resolution images show deltas and river valleys and gulleys that were there in the past. And in fact, _________ — which has been ______ on the surface now for about three years — has really shown us that it's sitting in an ancient river bed, where water _____________. And not for a little while, perhaps hundreds of millions of years. And if everything was there, including organics, perhaps life had started.

Solution

rapidly

curiosity

surprised

flowed

roving

series

Original Text

And so about 15 years ago, we started a series of missions to go to Mars and see if water existed on Mars in its past that changed its geology. We ought to be able to notice that. And indeed we started to be surprised right away. Our higher resolution images show deltas and river valleys and gulleys that were there in the past. And in fact, Curiosity — which has been roving on the surface now for about three years — has really shown us that it's sitting in an ancient river bed, where water flowed rapidly. And not for a little while, perhaps hundreds of millions of years. And if everything was there, including organics, perhaps life had started.